Nehemiah 6:17-19

Also, in those days the nobles of Judah were sending many letters to Tobiah, and replies from Tobiah kept coming to them. For many in Judah were under oath to him, since he was son-in-law to Shekaniah son of Arah, and his son Jehohanan had married the daughter of Meshullam son of Berekiah. Moreover, they kept reporting to me his good deeds and then telling him what I said. And Tobiah sent letters to intimidate me.